34/13—(34/15+2/5)=?(要简便)

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34/13—(34/15+2/5)=?(要简便)
34/13—(34/15+2/5)=?(要简便)

34/13—(34/15+2/5)=?(要简便)
34/13—(34/15+2/5)
=34/13-34/15-2/5
=34(1/13-1/15)-2/5
=34*2/195-2/5
=68/195-78/195
=-10/195
=-2/39

34/13—(34/15+2/5)
=34/13-34/15-2/5
=34(1/13-1/15)-2/5
=34*2/195-2/5
=68/195-78/195
=-10/195
=-2/39